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How to Add Custom Ringtones to a Wireless Doorbell 



Makej Projects 



How to Add Custom Ringtones 
to a Wireless Doorbell 

Written By: Jason Poel Smith 



TOOLS: 

Soldering iron and solder (optional) (1) 

Wire cutters (1) 

Wire stripper/crimper (1) 



PARTS: 

Wireless Doorbell (and reguired 
batteries) (1) 
9V recording module (1) 
(RadioShack Model: 276-1323) 
9 volt battery (1) 



SUMMARY 

By replacing the doorbell's original speaker with a recording module, the wireless doorbell is 
able to play custom ringtones. 

Here is a video summarizing the project. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 1 — How to Add Custom Ringtones to a Wireless Doorbell 




• Most doorbells just make a simple 
generic tone. But I thought that it 
would be fun to modify a doorbell 
so that it has a customizable 
ringtone. That way you can set it to 
play music or custom greetings. 
You could make it scream on 
Halloween and play carols at 
Christmas. 

• So in this project, I am going to 
share with you how to add a simple 
recording module to a wireless 
doorbell. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 2 — Materials 




• Materials: Wireless Doorbell (and 
required batteries), 9V recording 
module (RadioShack Model: 276- 
1323), 9 volt battery 

• Tools: Wire strippers, Wire 
Cutters, Soldering Iron and Solder 
(optional), Hot glue and hot glue 
gun (optional) 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 3 — Background: How the Wireless Doorbell Receiver Works 




• The circuit of the wireless receiver is divided into five main parts. 

• 1. The Radio Receiver: This section filters and amplifies the incoming radio signal. 

• 2. The Decoder Array: This array of jumpers is used to set either the device's tuning 
frequency or the security code on the IC chip. This helps to prevent it from interfering with 
other nearby wireless devices. 

• 3. The IC Chip: The IC chip monitors the incoming signal and detects when the button on 
the transmitter has been pressed. When the signal is detected, it sends a tone to the 
speaker. 

• 4. The Volume Control: This is a simple transistor amplifier that uses a variable resistor to 
set the speaker volume. 

• 5. The Speaker: The speaker is a plain 0.25W speaker. It is wired between the positive 
supply voltage and the volume control transistor. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 4 — Background: How the Recording Module Works 




• This recording module can store sound clips up to 20 seconds long. 

• The Play function is activated when the "play" pin on the chip is set to the logical LOW 
state (in this case less than 4 volts). This is normally accomplished by pressing the Play 
button which connects the pin to ground (0 volts). It can also be done with an external 
switch. 

• A close inspection of the circuit board reveals that there are two open pinholes that are 
also connected to the "play" pin. By attaching one wire to ground and one wire to either of 
these pinholes, you can use a secondary circuit or switch to activate the recording 
module. 

• In this project we will be using the output of the wireless receiver as the switch to initiate 
the Play function. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 5 — Remove the Original Speaker 




• The first step is to remove the original speaker. It will be replaced by the recording module 
which has its own speaker. Begin by removing any covers on the receiver so that the 
circuit board and the speaker are visible. Disconnect the speaker from the board by cutting 
the wires at the speaker terminals. 

• Remove any screws or fasteners that may be holding the speaker in place. Then remove 
the speaker from the housing. The speaker may be held in place by glue. If it does not peel 
away easily, you may need to use a sharp knife to carefully cut the speaker free. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 6 — Prepare the Wires on the Receiver 





CHIP ^™^^~^ 



• The only parts on the receiver that we will be modifying are the wires that went to the 
original speaker. First we need to determine the polarity of the speaker. Most speakers 
have their positive and negative terminals labeled. But if they are not labeled, you will need 
to determine this by examining how they are hooked up to the circuit board. 

• In my receiver, one speaker wire is connected to the positive supply voltage (the red wire). 
I am calling this the positive speaker wire. The other speaker wire is connected to the 
volume control transistor. I am calling this the negative speaker wire. 

• Cut the positive speaker wire as close to the circuit board as possible. This leaves you 
with a loose piece of wire. Strip at least 1/2" of insulation off both ends. On the negative 
wire, strip off at least 1/2" of insulation from the free end. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 7 — Connect the Receiver to the Recording Module 



SOI 



• The positive speaker wire that we just separated is used to connect the negative terminal 
of the receiver battery pack to the negative terminal of the recording module battery. Take 
one end of the positive wire and insert it into the negative terminal of the 9 volt battery. 
Then attach the 9 volt battery connector for the recording module. 

• This should pinch the wire and hold it in place. Then take the other end of the wire and 
wrap it tightly around the negative terminal of the receiver battery pack. Once you have 
everything mounted, the wires should stay in place. But if you want everything to be extra 
secure, you can tape them in place. 

• I do not recommend trying to solder wires to a battery terminal. 



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How to Add Custom Ringtones to a Wireless Doorbell 



Step 8 — Connect the Receiver to the Recording Module (Part 2) 




♦ The negative speaker wire will be used to connect the receiver output transistor to the 
"play" pin on the recording module. One end of the wire is already connected to the output 
transistor. So we just need to connect the free end to one of the play pin holes that were 
mentioned in Step 2. You don't need to solder the wire to the recording module. 

• You can make a good connection by just twisting the wires together around the board. To 
do this, Insert a few strands of the wire through one of the holes (the hole is probably too 
small to fit the whole wire). Then twist the strands of wire back together. As long as wires 
are tight, it should make a good connection and stay in place. 



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How to Add Custom Ringtones to a Wireless Doorbell 
Step 9 — Final Assembly 



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How to Add Custom Ringtones to a Wireless Doorbell 




• Then just insert all the parts into 
the housing and your customizable 
doorbell is complete. If you don't 
want the parts to be loose, you can 
fix them in place with hot glue or 
some other adhesive. To set the 
ringtone, just hold the microphone 
up to your computer speakers and 
press the Record button as you 
play a sound file that you want to 
use. 

• Then, whenever someone presses 
the button on the transmitter, the 
doorbell will play your custom 
ringtone. 

• Design Notes: The recording 
module that I used was not as loud 
as the original tone. So if you want 
to make it louder you can replace 
the speaker on the recording 
module or use it as the input to 
powered computer speakers. 

• Since the Play button also 
functions as a Stop button, the 
playback will be interrupted if 
someone presses the doorbell 
multiple times before the tone is 
finished. You can fix this by adding 
a capacitor between the recording 
module's ground and Play pin. This 
will also help prevent stuttered 
playback that may happen with 
some wireless doorbells. 



st generated on 2012-11-26 11:02:01 PM. 



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